Hello, i use RSS, Tantares with your mod, I ran into a problem, namely with the RD-0120 (ENERGIA-M) thrust, the problem is that when the boosters separate, the launch vehicle stops accelerating, or rather, the RD-0120 does not have thrust... After a while, I decided to find a configuration related to fuel density, as I understood it with liquid hydrogen, set the value as in stock, and the rocket began to take off, though too fast, but nevertheless, the result was.
What can be done about it? With your mod, the RD-0120 has real thrust as an IRL, ISP, and the like... Sorry for my english.